In the same way, "Abraham believed God, so God declared him righteous because of his faith."
The real children of Abraham, then, are all those who put their faith in God.
What's more, the Scriptures looked forward to this time when God would accept the Gentiles, too, on the basis of their faith. God promised this good news to Abraham long ago when he said, "All nations will be blessed through you." And so it is: All who put their faith in Christ share the same blessing Abraham received because of his faith.
But those who depend on the law to make them right with God are under his curse, for the Scriptures say, "Cursed is everyone who does not observe and obey all these commands that are written in God's Book of the Law."
Galatians 3:6-10 NLT